Add Additional Search Criteria - Customer Search - Enterprise Search

Hi ,

I have appended a ZFIELD in the KNA1 table as well as in the /MDGBPX/_s_BP_ES_BP_CUSGEN structure.

Now want to add this ZFIELD as an additional search criteria in the  initial customer search dropdown for Enterprise search.

Referred the guide -  How To MDG - Material Extend Search . In Most part of this document they have explained steps to add search criteria for MDG

6.1 . But I am looking for a solution to implement it on MDG 7.

Please advise how can I add custom attribute ( ZFIELD ) as a new search  criteria ?

Best Regards,

Vicky